[usdUtils] don't recreate st and pref tokens every time #1283
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Filed as internal issue #USD-6265 |
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Description of Change(s)
This is admittedly a pretty minor performance fix - but it bothered me that we were always dynamically creating the "st" and "pref" tokens in UsdUtils. Sort of goes against the point of the whole TfToken system. This PR fixes this by making static tokens for these, and returning those.